Skiving machine



April 19, 1955 E. H. BECK SKIVING MACHINE s sh ets-sheet 1 Original Filed April 23, 1953 um mu u lllllflllllllll III INVENTOR, Euwm H. BECK,

A TT'ORNE Y5.

April 19, 1955 E. H. BECK SKIVING MACHINE 5 Sheets-Sheet 2 Original Filed April 25 1953 INVENTOR, EDWIN H. BECK,

ATTORNEYS.

April 19, 1955 E. H. BECK 23,982

' SKIVING MACHINE Original Filed April 23, 1953 3 h ets- 3 FIGS.

I N VEN TOR, [ow/N H. BECK.

A TTORNEYS.

United States Patent Ofilice Re. 23,982 Reissuecl Apr. 19, 1955 SKIVIN G MACHINE Edwin H. Beck, Lemay, Mm, assignor to Manufacturers Supplies Co., St. Louis, Mo., a corporation of Missouri Original No. 2,687,634, dated August 31, 1954, Serial No.

350,672, April 23, 1953. Application for reissue February 18, 1955, Serial No. 489,314

15 Claims. (c1. 69--9.5)

Matter enclosed in heavy brackets appears in the original patent but forms no part of this reissue specification; matter printed in italics indicates the additions made by reissue.

This invention relates to skiving machines, and particularly to machines for use in skiving the margins of shoe parts.

In the manufacture of shoes, it is frequently necessary to provide a blank with several scarfs of different shape. In the case of a shoe upper, for example, a relatively flat, folding cut is made along the top margin for hem- Ining purposes; a gentle bevel is made along the bottom edge where the quarter is secured to the vamp; and a rather steep slanting cut is made along the back edge where the heel or counter part of the shoe is formed.

The machine commonly employed for such skiving is of a type wherein the Work is fed between a resilientlymounted feed roller and a relatively fixed presser foot against the edge of a rotating cylindric knife. In making marginal cuts, the surface of the feed roller and the opposed surface of the presser foot are in general but not necessarily exact parallelism with the upper cutting part of the rotating knife. The position of the presser foot relative to the knife edge determines the character of the scarf, the presser foot being adjustable in elevation to vary the depth of the cut and being angularly adjustable to vary the slant of the cut. In preparing a part, such as the above-described shoe upper, the practice heretofore has been to employ three machines, each of which is set to make a different cut, or the practice has been one of making three different runs on the same machine, with the presser foot being reset between each run. In either case, a given piece of work is handled several times and there is a lack of flexibility in the overall operation.

It is accordingly an object of the present invention to provide a skiving machine of the character described, which substantially simplifies the handling operations and which offers greater flexibility. More particularly, the invention contemplates a machine that permits an opera tor to make several different cuts without substantially lifting the piece from the machine orin any way adjusting the machine except by relatively quick treadle action.

To these ends I propose that the skiving machine be provided with an upper actuating lever for varying the elevation of the presser foot and a lower actuating lever for varying the angle of the presser foot relative to the cutting edge of the knife. These actuating levers are mounted for vertical movement and are in turn under the control of at least one, and preferably two, treadleactuated members, which are mounted for vertical movement from retracted positions to predetermine actuated positions. Adjustably-positionable lever-engaging elements on each of the treadle-actuated members engage the levers and reset the presser foot on manipulation of either member to its predetermined actuated position. In a preferred form of the invention, the presser foot is pivotally carried upon the lower end of a vertically movable support, the upper actuating lever is pivoted ad acent the upper end of this support for cooperation therewith, and the lower lever is fixed to the presser foot.

In use, the machine is adjusted in the usual manner to make a rather shallow and flat cut. The lever-engaging elements are then adjusted to actuate the levers and reposition the presser foot for making cuts of dlfferent slope and depth.

Other features of the invention'will be in part apparcut from and in part pointed-out in the following detail description taken in connection with the accompanying drawings, in which:

Fig. l is an end elevational view of a skiving machine incorporating the mechanism of this invention;

P Fig. 2 is a top plan view of the apparatus shown in Fig. 3 is a diagrammatic view of the skiving machine, showing the mechanism of this invention;

Fig. 4 is a detail view of the feed roller and presser foot, illustrating one type of cut;

Fig. 5 is a view similar to that of Fig. 4 showing an alternative type of cut;

Fig. 6 is a view like that of Fig. 4, showing still another cut; and,

Fig. 7 is a fragmentary sectional view illustrating details of the presser foot and its supporting member.

Referring to the drawings there isshown a skiving machine of a type in general use. The machine includes a housing 1, which functions as a frame enclosing certain operating parts, and which is secured on a workbench partially shown at 3. A cup-like knife 5 is mounted within the housing at one end'of a driven shaft 7, which extends longitudinally of the machine. As in"- dicated at 9, an upper cutting part of the knife projects endwise from the upper surface of the housing so that work may be fed thereto in a direction indicated by the arrow. Immediately below the cutting area 9, there is a roller 11 mounted with its axis transverse to the knife axis. This roller may have an emery surface for relatively fine work or a knurled surface for relatively heavy work, the surface being curved in the axial direction so as to fit the curve of the knife.

The work piece is guided by means of a member 12, generally called a presser foot, which is mounted above the feed roller 11 adjacent the cutting part 9 of the knife. While the details of the mechanism for mounting and driving the feed roller are only patrially shown herein, they being known in the art, it will be understood that the feed roller is resiliently mounted for both tilting and radial movement in response to movement of the work piece beneath the presser foot. For example, the feed roller may be carried in a yoke (partially shown at 13) which is pivoted along a pair of horizontal axes, one extending transversely and the other parallel to the roller axis to permit both downward and tilting movement of the roller 11. Springs attached to the frame and yoke bias the roller upwardly toward the presser foot.

The feed roller is coupled by a driving shaft member 15 through a universal joint (not shown) to a transverse shaft 17. This shaft 17 is connected at a gear box 19 to a lateral shaft 21, which extends across the rear of the machine. Shaft 21 in turn is belt-connected at 23 to the knife shaft 7, and both are driven from a belt drum 25..

Vwhile the machine may also include a grinding wheel for sharpening the outer surface of the knife and a scrap remover within the knife together with various adjustments for the sharpening wheel, scrap remover, knife and feed roller, these are omitted for purposes of clarity. Also, a guide cover plate 27 shown in Fig. 2 is omitted from the showing of Fig. l for purposes of clarity.

In operation, the guide surface 29 of the presser foot functions to guide material against the knife edge 9, the feed roller 11 yielding an amount suflicient to accommodate the work while providing a driving engagement with the work. The character of the cut is determined by the position of the guiding surface 29 of the relative to the cutting part 9 of the knife.

in accordance with this invention, the presser foot 12 is pivotally mounted upon the lower end of a plunger 31. As shown more particularly in Fig. 7, an extension 36 on the lower end of the plunger carries a ball thrust bearing 32, and the presser foot 12 is mounted against the bearing on a pivot pin 33, which may be removably secured, as by a clip member 34, in order to permit replacement of the presser foot. The plunger 31 is slidably received within a column 35 over the feed roller and is biased upwardly by means of a spring 37, which abuts against a cap 39 screwed into the upper end of the plunger 31. The lower end of the spring 37 seats presser foot the levenactuating elements are thumb screws threaded through said feet.

6. Apparatus as set forth in claim 3 wherein the movable support for the presser foot is spring biased upwardly and includes means for adjustably presetting the upper position of the support.

7. Apparatus as set forth in claim 3 wherein the lower actuating member is spring biased upwardly and wherein the apparatus includes adjustable means for presctting the upper position of the lower actuating element.

8. Apparatus as set forth in claim 3, wherein said slide member is spring biased upwardly.

9. In a skiving machine of the type wherein the work piece is fed against a rotary knife from between a feed roller and a presser foot; the improvement comprising treadleactuated mechanism for changing the angle of the presser foot relative to the knife, said mechanism including a member for actuating the presser foot, 21 second member arranged for treadle actuation, and a lost-motion connection between said first member and said treadleactuated member.

10. Apparatus as set forth in claim 9, further including a third member for changing the spacing between the presser foot and the knife, and-a lost-motion connection between said third member and said treadleactuated member.

11. Apparatus as set forth in claim 10, wherein said lost-motion connections are constituted by adjustable elements carried by the treadle-actuated member for engagement with said other members.

12. Apparatus as set forth in claim 9, wherein the presser foot is pivotally mounted upon a support by means of a pivot pin and a ball thrust bearing.

13. In a skiving machine having a rotatable knife, 0 resser-foot support mounted for movement mvny from and toward the knife, and a presser foot pivot-ally connected to the presser-foot support; the improvement which comprises means for hacking said Presser foot about its pivotal connection with said support, said means being movable into any one of a plurality of predetermined positions, and qnick-actirzg operator-controlled means coupled to actuate said rocking means selectively into one 0 said predetermined positions.

14. A slciving nmchine as set forth in claim 13, further including adjustable means associated with said quickocting topenator-controlled means for controlling the actuation of said rocking means by said quickwcting operatorconrrolled means.

15. A skiving machine as set forth in claim 14, further including elevating means for moving the presser-fioot support away from and toward the knife, said elevating means being movable into any one of a plurality of predetermined positions, said quick-acting operator-controlled menns being coupled to actuate said elevating means selectively into one to said predetermined positions, and adjustable means associated with said quickacting opcraiowoontno'lled means for controlling the actuation of said elevating means by said quick-acting openator-controllea' moans.

No references cited. 

